Abstract
Low-porosity layered calcium cobaltite-based ceramics with copper additions have been prepared by hot pressing and their microstructure and electrical transport and thermoelectric properties have been studied. The results demonstrate that the addition of copper particles to the ceramics reduces the average particle size of the Ca3Co4O9 + δ phase and the thermoelectric power and porosity of the samples and increases the electrical conductivity and thermoelectric power factor (P) of the ceramics. The highest thermoelectric power factor is offered by the hot-pressed ceramic with the composition Ca3Co4O9 + δ + 2 wt % Cu (P1100 = 521 μW/(m K2)), which is a factor of 1.4 higher than that of the basic material Ca3Co4O9 + δ having the same thermal history (P1100 = 363 μW/(m K2)) and more than five times the thermoelectric power factor of low-density Ca3Co4O9 + δ ceramics prepared by conventional solid-state reactions.
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